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The Passes menu is located at the top of the main Fortnite lobby menu. Then select the Music Pass option, and click “Get Music Pass.” If you have enough V-Bucks in your Epic account ...

In Fortnite, you can use map codes via the lobby screen. Open the game, and once you find yourself in the game lobby, click on the 'Search' icon that appears on the top left side of the game screen.